25 Yrs No Kids 34 B (Barely) Hoping for a Nice C - Barrington, IL

I am a 25 year old scheduled for augmentation in November. I have been waiting for my boobs to come since i was 11 years old and sadly they never did. I am considered a 34 b however i dont feel like it and i hate the shape of my boobs especially compared to my body. I am 5"4 145 pounds athletic build with broad shoulders from years of gymnastics and quite a solid lower body/butt. I believe 12 cm width breast. I have been self conscious my whole life about my breasts. i hate bra and swim suit shopping, I hate even being in a swim suit. I hated having my top off even in front of a long term ex. I hate how I look in alot of clothes. I just want my whole body to match up and I want to feel like a real woman finally. I had my consultation and my PS recommends 350 moderate plus silicone mentor under the muscle however I'm so nervous this will make me too big. I'm very modest and athletic and would hate if I were too big and they looked like huge balloons and got in the way. I'd also love to be able to still wear some of my old clothes and not need a Full new wardrobe, I JUST want a nice shape and some cleavage and some CONFIDENCE! He said this could make me a d and I know I'm not supposed to judge by cups but a D scares the hell out of me. I'm planning 9-10 days off work and hoping this is enough..I'm an rn and work 12s. I just want the answer for what the right size is to fall into my lap!! I'm personally leaning for 325 though i understand the insignificance of the difference i think the smaller number gives me comfort. sometimes i even consider 300. I see some people with 325 or 350 that look HUGE and some that look awesome..just so torn ! All i do is look up boobs and sizes looking for the right answer, im obsessed! I have tons of wish pix for my doctor at my week preop and already showed him some. I trust him and have seen awesome results so I don't know why I'm freaking so much! I just want to be able to relax and start getting excited